flight instrumentsFAA-published sample question (IRA, Aug 2021)
If both the ram air input and drain hole of the pitot system become blocked, the indicated airspeed will
A
increase during a climb.✓ Correct Answer
B
decrease during a climb.
C
remain constant regardless of altitude change.
Explanation
PHAK Chapter 8 explains that with both the pitot ram inlet and the drain hole blocked, the air pressure trapped in the pitot line stays constant, so the airspeed indicator behaves like an altimeter. As the aircraft climbs, static pressure falls while the trapped pitot pressure does not, so the indicated airspeed increases (and decreases in a descent) regardless of actual airspeed.
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